When using a moveable pulley to lift an object, of the object's weight is supported by the section of rope attached to the ceiling. this is why a moveable pulley requires effort force than a fixed pulley to lift an object. a. half, less b. all, less c. half, more d. all, more

the skeletons of most mammals reach a certain size and then stop growing. however, many animals, including some mammals, keep growing throughout their lives. kangaroos, for example, just keep growing and growing until they die. also, the longer an animal lives the greater the chance it might catch some deadly disease.